Tangent Law

What is the main purpose of the tangent galvanometer experiment?

A tangent galvanometer of reduction factor $\mathrm{IA}$ is placed with plane of its coil perpendicular to the magnetic meridian when a current of $\mathrm{IA}$ is passed through it. The defection produced is

The sensitivity of a tangent galvanometer increases, if

The tangent galvanometer, when connected in series with a standard resistance can be used as

Two tangent galvanometers having coils of the same radius are connected in series. A current flowing in them produces deflections of $60°$ and $45°$ respectively. The ratio of the number of turns in the coils is

The curve that may best represent the current vs deflection in a tangent galvanometer is

Consider two short magnets $A$ and $B$ whose lengths are in $1:2$ ratio and the pole strength are in $1:3$ ratio. The magnet produces a $30°$ deflection when placed at a certain distance in $\tan A$ position of the magnetometer. If the magnet $B$ is placed at the same distance in $\tan B$ position of the magnetometer, then find the deflection produced:

Cotyledons are also called-

A coil carrying a heavy current and having large number of turns is mounted in a N - S vertical plane. A current flows in the clockwise direction. A small magnetic needle at its centre will have its north pole is

A rectangular coil $3\times 3$ cm consisting of 100 turns caries 0.1 A. If it produces a deflection ${10}^{\mathrm{o}}$ , in a field of induction 0.1T, the couple per unit twist is

Assertion: A tangent galvanometer is used for measuring current. 

Reason: As it is direct reading.

Assertion: Reduction factor $\left(K\right)$ of a tangent galvanometer helps in reducing the deflection of a current.

Reason: Reduction factor increases with increase in current.

The tangent galvanometers having coils of the same radius are connected in series. A current flowing in them produces deflections of $60°$ and $45°$ respectively. The ratio of the number of turns in the coil is -

A short magnet produces a deflection of $30°$ when placed at certain distance in $\mathrm{t}\mathrm{a}\mathrm{n}\mathrm{A}$ position of magnetometer. If another short magnet of double the length and thrice the pole strength is placed at the same distance in $\mathrm{t}\mathrm{a}\mathrm{n}\mathrm{B}$ position of the magnetometer, the deflection produced will be

A tangent Galvanometer is connected directly to an ideal battery. If the number of turns in the coil is doubled, the deflection will

Two tangent galvanometers $A$ and $B$ have coils of radii $8 \mathrm{cm}$ and $16 \mathrm{cm}$ respectively and resistance $8 \mathrm{\Omega }$ each. They are connected in parallel with a cell of emf $4 \mathrm{V}$ and negligible internal resistance. The deflections produced in the tangent galvanometers $A$ and $B$ are $30° \mathrm{a}\mathrm{n}\mathrm{d} 60°$ respectively. If $A$ has two turns, then $B$ must have

Two tangent galvanometers $A$ and $B$ have coils of radii $8 \mathrm{cm}$ and $16 \mathrm{cm}$, respectively, and resistance $8 \mathrm{\Omega }$ each. They are connected in parallel with a cell of emf $4 \mathrm{V}$ and negligible internal resistance. The deflections produced in the tangent galvanometers $A$ and $B$ are $30°$ and $60°$, respectively. If $A$ has $2$ turns, then $B$ must have

A deflection magnetometer is placed with its arm along the east-west direction and a short bar magnet is placed symmetrically along its axis at some distance with its north pole pointing towards east. In this position the needle of the magnetometer shows a deflection of $60°$. If we double the distance of the bar magnet, then the deflection will be

A compass needle free to turn in a horizontal plane is placed at the centre of a circular coil of $30$ turns and radius $12 \mathrm{cm}$. The coil is in a vertical plane making an angle of $45°$ with the magnetic meridian. When the current in the coil is $0.35 \mathrm{A}$, the needle points west to east.
The current in the coil is reversed and the coil is rotated about its vertical axis by an angle of $90°$ in the anticlockwise sense looking from above. Predict the direction of the needle. Take the magnetic declination at the places to be zero.

A compass needle free to turn in a horizontal plane is placed at the centre of circular coil of $30$ turns and radius $12 \mathrm{cm}$. The coil is in a vertical plane making an angle of $45°$ with the magnetic meridian. When the current in the coil is $0.35 \mathrm{A}$, the needle points west to east.
The current in the coil is reversed and the coil is rotated about its vertical axis by an angle of $90°$ in the anticlockwise sense looking from above. Predict the direction of the needle. Take the magnetic declination at the places to be zero.